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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Instantaneous Engine Speed Time-Frequency Analysis for Onboard Misfire Detection and Cylinder Isolation in a V12 High-Performance Engine
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Instantaneous Engine Speed Time-Frequency Analysis for Onboard Misfire Detection and Cylinder Isolation in a V12 High-Performance Engine

机译：V12高性能发动机的机载失火检测和缸隔离的瞬时发动机转速时频分析

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The diagnosis of a misfire event and the isolation of the cylinder in which the misfire took place is enforced by the onboard diagnostics (OBD) requirements over the whole operating range for all the vehicles, whatever the configuration of the engine they mount. This task is particularly challenging for engines with a high number of cylinders and for engine operating conditions that are characterized by high engine speed and low load. This is why much research has been devoted to this topic in recent years, developing different detection methodologies based on signals such as instantaneous engine speed, exhaust pressure, etc., both in time and frequency domains. This paper presents the development and the validation of a methodology for misfire detection based on the time-frequency analysis of the instantaneous engine speed signal. This signal contains information related to the misfire event, since a misfire occurrence is characterized by a sudden engine speed decrease and a subsequent damped torsional vibration. The identification of a specific pattern in the instantaneous engine speed frequency content, characteristic of the system under study, allows performing the desired misfire detection and cylinder isolation. Particular attention has been devoted to designing the methodology in order to avoid the possibility of false alarms caused by the excitation of this frequency pattern independently from a misfire occurrence. Although the time-frequency analysis is usually considered a time-consuming operation and not associated to onboard application, the methodology proposed here has been properly modified and simplified in order to obtain the quickness required for its use directly onboard a vehicle. Experimental tests have been performed on a 5.7 1 V12 spark-ignited engine run onboard a vehicle. The frequency characteristic of the engine-vehicle system is not the same that could be observed when running the engine on a test bench, because of the different inertia and stiffness that the connection between the engine and the load presents in the two cases. This makes it impossible to test and validate the methodology proposed here only on a test bench, without running tests on the vehicle. Nevertheless, the knowledge of the mechanical design of the engine and driveline gives the possibility of determining the resonance frequencies of the system (the lowest one is always the most important for this work) before running tests on the vehicle. This allows saving time and reducing costs in developing the proposed approach.
机译：失火事件的诊断和发生失火的气缸的隔离通过所有车辆的整个运行范围内的车载诊断（OBD）要求来执行，无论它们安装的引擎配置如何。对于具有大量汽缸的发动机以及以高发动机转速和低负荷为特征的发动机工况而言，该任务特别具有挑战性。这就是为什么近年来在此主题上进行了大量研究的原因，他们基于时域和频域的信号，例如瞬时发动机转速，排气压力等，开发了不同的检测方法。本文介绍了基于瞬时发动机转速信号的时频分析的失火检测方法的开发和验证。该信号包含与失火事件相关的信息，因为失火的发生的特征在于发动机转速突然降低以及随后衰减的扭转振动。瞬时发动机转速频率含量中特定模式的识别（所研究系统的特征）允许执行所需的失火检测和气缸隔离。为了避免与失火事件无关而由该频率模式的激发引起的误报的可能性，已特别注意设计方法。尽管时频分析通常被认为是一项耗时的操作，并且与车载应用无关，但是这里提出的方法已经过适当修改和简化，以便获得直接在车辆上使用所需的快速性。已经在车辆上运行的5.7 1 V12火花点火发动机上进行了实验测试。发动机-车辆系统的频率特性与在试验台上运行发动机时可能观察到的频率特性不同，这是因为在两种情况下，发动机与负载之间的连接呈现出不同的惯性和刚度。这使得无法仅在测试台上测试和验证此处提出的方法，而无需在车辆上进行测试。尽管如此，了解发动机和传动系统的机械设计仍可以在对车辆进行测试之前确定系统的共振频率（最低频率始终是这项工作中最重要的）。这样可以节省时间并降低开发建议方法的成本。

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